alt Hacker NewsFrom your link:
Essentially the bottom cover of the MacBook Air becomes one large heatsink
Anyway, the author claims:
you are the type that likes to work with the MacBook Air on your lap it will be quite a bit more toasty than before.
Does toasty mean extremely hot?
The Apple M4 CPU is, if I recall correctly, capable of converting 20 watts of electrical energy in to heat, at full throttle.
Is that likely to bring the back plate or a MBA above 45 degrees?
You’re probably right, with sustained workloads it could.
Everything’s a trade off.
In a Notebookcheck test, they got the bottom plate up to 43C, and top plate near the screen up to 45C: https://www.notebookcheck.net/The-passively-cooled-M4-SoC-ma...